The countries having natural frontiers with India are?

The correct answer is Option (1) → China, Burma and Nepal

A natural frontier is a border formed by a natural feature — a mountain range, a river or the sea — rather than by a line drawn on the map.

• China and Nepal — India’s borders with both run along the Himalayas.

• Burma (Myanmar) — the border follows the Purvanchal hills: the Patkai, Naga and Mizo hills.

The other names in the options do not fit: the short border with Afghanistan, as India shows it on its map, lies in the part of Jammu and Kashmir under Pakistan’s occupation; the border with Bangladesh runs mostly across the plains of the Ganga–Brahmaputra delta and was drawn on the map in 1947; and India has no border with Russia.